From: Peter Zijlstra <peterz@infradead.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Lists linaro-kernel <linaro-kernel@lists.linaro.org>
Subject: Re: [Query]: tick-sched: why don't we stop tick when we are running idle task?
Date: Mon, 14 Apr 2014 14:06:00 +0200 [thread overview]
Message-ID: <20140414120600.GJ11096@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CAKohpon=_ZR+QbfacGT+G_atgcc21KMYG3YxPf0nkSDLBH8Q2A@mail.gmail.com>
On Mon, Apr 14, 2014 at 05:22:30PM +0530, Viresh Kumar wrote:
> On 14 April 2014 17:17, Peter Zijlstra <peterz@infradead.org> wrote:
> > What causes this tick? I was under the impression that once there's a
> > single task (not doing any syscalls) and the above issues are sorted, no
> > more tick would happen.
>
> This is what Frederic told me earlier:
>
> https://lkml.org/lkml/2014/2/13/238
That's a bit of a non-answer. I'm fairly sure its not a gazillion
issues, since the actual scheduler tick doesn't actually do that much.
So start by enumerating what is actually required.
The 2), which I suppose you're now trying to implement is I think
entirely the wrong way. The tick really assumes it runs local, moving it
to another CPU is insane.
next prev parent reply other threads:[~2014-04-14 12:06 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-09 10:33 Viresh Kumar
2014-04-09 10:49 ` Viresh Kumar
2014-04-10 14:39 ` Frederic Weisbecker
2014-04-11 10:04 ` Viresh Kumar
2014-04-11 14:53 ` Frederic Weisbecker
2014-04-11 15:18 ` Peter Zijlstra
2014-04-11 16:38 ` Viresh Kumar
2014-04-14 9:48 ` Preeti Murthy
2014-04-14 9:51 ` Viresh Kumar
2014-04-14 11:02 ` Peter Zijlstra
2014-04-14 11:42 ` Viresh Kumar
2014-04-14 11:47 ` Peter Zijlstra
2014-04-14 11:52 ` Viresh Kumar
2014-04-14 12:06 ` Peter Zijlstra [this message]
2014-04-15 6:04 ` Viresh Kumar
2014-04-15 9:30 ` Frederic Weisbecker
2014-04-15 10:52 ` Peter Zijlstra
2014-04-15 10:53 ` Peter Zijlstra
2014-04-23 11:12 ` Viresh Kumar
2014-05-09 8:44 ` Viresh Kumar
2014-05-13 23:30 ` Frederic Weisbecker
2014-05-22 8:44 ` Peter Zijlstra
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